Gage-glass cock.



R. & ,G. N. SHAD.

GAGE GLASS 000K.

APPLICATION FILED 832113, 1907.

55 I a? 3 Z9 6 5 /5 Patenteg Dec. 29, 1908.

I steam boilers, ammonia and also to UNITED STATES M ROBERT M. SHAD AND GUY N, SHAD; 01; NEW

ORLEANS, LOUISIANA.

GAGE-GLASS COCK.

To all whom it may concern:

Be it known that we, ROBERT M. SHAD and GUY N. SHAD, citizens of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented new and useful Improvements in Gage-Glass Cocks, of which the following is a specification.

Our present invention relates to improvements in gage glasses. adapted for use on and liquid tanks, and other regeptacles for indicating the level of the liquidcontained therein, and it has for its obect to provide an improved device of this character that is capable of automatically'interrupting the flow of the liquid or fluid when the gage glass is broken in order that scalding ofthe attendants or other damage may be avoided, the interruption of the fluid Slllcll as hot water permitting renewal of the g ass.

Another object of the invention is to provide means for restablishing communication between the gage glass and the boiler or other receptacle to which it is applied, prevent accidental shutting ofil of the gage glass from the boiler while the conposes of repair and to tents of the glass are being blown off.

A further object of the invention is to provide automatically operating check valves which are so mounted that they may be readily removed and replaced for the purcutting off the check valves from the boiler or other receptacle while the check valves are being removed or replaced, this. being particularly advantageous when the gage ,glass is applied to a steam boiler, for the reason that it enables the check valves to be repaired or otherwise adjusted while the boiler is under pressure.

To these and ether-.;-ends, the invention consists in certain-improvements and coinbinations and arrangementspf parts, all as will be hereinafter more-fully-described and pointed out end of the specification.

In the accompanying drawing:-Figu-re 1 represents a central vertical sectional view of a gage glass constructed in accordance with the present invention, the'check valves being in normal operative position. Fig. 2- me v represents a transverse section on the 22 of Fig. 1. Fig. 3 is a perspective view of one of the 'check5valves and the indicator connected thereto. Fig. a perspective Specification of Letters Patent. Application filed September 13, 1901. Serial Nb. 392,69

provide means for particularly in the claims at the,

PatentedDec. 2.9, 1908.

view of one of the removable check valve seats.

Similar parts are designated by thesame reference numerals in the several figures,

The gage shown inthe present embodiment of our invention comprises generally a pair of upper and lower valve casings l and 2 which are provided with the threaded ends 3 and 4, to enter corresponding threaded openings in the boiler or other receptacle to which the gage is applied, these stems being provided with ports 5 and 6, leading intothe respective valve casings.

substantially hollow and are divided by the The latter are partitions or septums 7 and 8, the latterbeing provided with automatically operating valves which serve to control communication between the gage glass and the boiler or other receptacle. In the present instance a pair of grayity operated check valves are employed, the partitions or septums being ill-7 cli-ned relatively to the vertical in order that check valves of the pivoted type may be employed that would have a normal tend- ,ency to remain in open osition until the pressure within the gage g ass is released, at which time the pressure behind the valves will lift them into engagement with their respective seats and thereby prevent the flow of steam and water from the boiler.

In order to facilitate the mounting of the valves and to enable them; to be removed and replaced whenever necessary or desir able, it is preferable to mount them removably within the respective valve casings, the valves shown in thepresent instance being each composed of a bushing 9 and which is threaded into the septum or partition of its respective valve casing and is provided with a valve seat 10 to cooperate with a shutter 11, the latter being provided at its upper edge with hinged lugs 12' in which the pintle.

'13 is rigidly fitted, the latter passing loosely through a hinge "lug 14 on the bushing and serving as a pivotal connection between the latter and the shutter. The pintle preferably extends through one of the walls of'the valve casing and is providedat the exterior thereof with an appropriate indicator 15, that shown in the present to form a sight aperture, the latter ranged to cooperate with ap ropriate Indici'a which is suitably inscribed on a plate 16 arranged on the exterior of the valve casing, the indicia serving to indicate whether the instance being pro- -vided with a looped portion at its upper end mg arvalve or shutter connected to the pintle is in the open or closed position.

,1 The up er and lower valve casings are provided with u wardly inclined bosses 17 and 18 and whic are threaded to receive the valve bonnets 19 and 20, the latter in turn being interiorly threaded to receive the-respective valve stems 21 and 22, stuffing boxes 23 and 24 on the upper ends of the bonnets serving to pack the valve stems and thereby prevent leakage.

able operating handles or wheels'25 and 26 by means of which the valve stems may be rotated and the inner ends of the latter are provided with reduced extensions 27 and 28 which are arrangedin alinement with and adapted to project throu h the central apertures 29 and 30 in'the' bushings of the respectiveicheck valves, the extensions bein of a length sufficient to engage the pivote shutters of the respective check valves and ermit the water,

thereby unseat them and or steam to flow from the oiler to the gage glass, the reduced extensions of the respective-stems being of a diameter less than that of the passages 29 and 30 in the respective valve seats so as to permit passage of fluid while the extensions extend therethrough.

In order to prevent interruption of communication between the gage glass and the boiler, while the sediment is being'blown from the latter, it is preferable to provide conical valve seats 31, 32, arrangedin alinement with and adapted to cooperate with the correspondingly formed seats 33 and 3 I tween the compartments of each valve casing being controlled by the check valve and also by the stop valves formed by the valve stems 21 and 22, the compartments 36 and 38 of the respective valve casings havin passages 39 and 40 which lead'to the gage glass. The opposite ends of the latter are inserted into the oppositely directed stems 41 and 42, the

latter being threaded, as usual, to receive the stuffing boxes 43 and 44 which serve to pack the glass and thereby prevent leakage between it and the valve casings. 1

Access-may be had to the interior of the compartments 35 and 37 of the respective valve casings through theopenings 45 and 46 into which the stems 3 and 4 are'threaded or' otherwise detachably secured, and order The other ends. of these valve stems are provided with suit-.

to permit removal of the respective casings to enable the check valves to be repaired while the boiler is under pressure, it is preferable to provide the respective stems with a pair of cut-offs, those shown in the present instance being composed of plug valves 47 and 48 which control the passages through the respective stems and are accessible for operation from the exterior thereof. The petcock 49 is arranged on the lower valve cas- ,ings, as usual, and is preferably tapped into the compartment 37, its purpose being to drain the gage glass and its communicating passages of sediment;

In practice the check valves are normally in open position and the valve stems'21, 22 are retracted so as to withdraw the reduced extensions thereon into a position that will notinterfere with the operation of the check valves, the plug valves or cut-ofis which control communication through the attaching stems of the res ective casings being also in open position, t e sight apertures in the respective indicators registering with those-= portions of the respective scales which'indicate the .open positions of the check valves. Should the gage glass become broken, a fall in pressure wil occur in the compartments 36 and 38 of the respective valve casings,- the pressure in the com artments 35 and 37 thereof causing the c eck valves to immediately close and thereby interrupt the flow of the water and steam to the gage glass, the check valve remaining in-closed position and permitting renewal of the broken glass. After the new glass has been inserted, communication is reestablished by operating the stems 21 and 22 until the reduced GXtGIlSlOIIS thereon pass through the bushings of therespective check valves and dislodge the shutters thereof from their respective seats, and when the ressure in the two compartments of each va ve casing is equalized, the shutters of both checkvalveswill remain in 0 en posi tion under the action of gravity. T e stems 21 and 22 are then retracted to the position shown in Fig. 1 so that the check valves may be closed automatically should the glass again become broken.

Inblowing off the sediment from the age glass and its communicating assages, t ere may be a tendency of the c eck valves to close by reason of the reduction in pressure.

within the gage glass, and in order to prevent closing of these valves at'this time, the stems 21 and 22 are screwed in until the extensions thereon lproject beyond the seats for the respective s utters pre aratory to the opening of the pet-cock, suc an adjustment o the stems serving to prevent closing of the check valves during the blowing off operation. Whenever-it is desirable or necessary to repack the stuifing boxes for the gage glass, it is only necessary to screw in'the valve stems 21, 22 until'the valve seats 31 oes ho municating with wanna 32't ereon cooperate w h the c rresiiondingvaJv-e. seats. n t e chec l e onencommunication. et een the gage as and the oiler e g her by in e rup ed. so that th .v stufingboa may be or ented ent re y wi hout danger ct scalding. i-ther otth hfitk vai as may he r move fr m its IQ? snoot vo lve as ng h le the b iler is nde p ure, by; u t ng off he esp ti e. ou 013 or plug valve n, t .e ste f he cas ng and th n, uns rewing he cas g- ,Dlll the stem, the opening into which the stem fits roviding means ct access to the valve. T e indi-" cators connected to the, check valves will in o teuhdor y' m ahc he 0 1'- ied by the respective c eck valves- A gage constructed in accordancewith our present invention s especially. eflicient when a plied torsteam boilers, ammonia tanks, and

. e l ke wherein it is desirable or necessary to e 1 e ia h n e im t h fl w f'st a ammonia, or other liqni to the ga e glass should breakage of the latter occur, the gage shown n t e p en em dimen f ur nven ion being provided with automatically operating valveswhich operate, the moment breakage the, glass, occurs, although closure of the automaticvalves during blowing off of, the glass is, prevented by the aid of stop valves which are conveniently operable from the exterior oi the valve casings and also, serve 'topositively cut off communication between the glass and the boiler or other receptacle.

re'over, he aut mat va es a m ably fi ted nt the re p ti e valve as ng S0 hat: l Qt only isiit possible to cast the lattereach, a, ing e pie e, ut he alve may e eadily n e ted andr movedrelatively t their respective casings and even whilethe boiler 1s" under pre sure y pr v a detachable connection between, each casing and. its, respective nipple or. attaching stem,

and the, dfivioe is of. such a, sim lo, and compact cql struction that it may e manufactured at a. reasonable. cost and its parts are not liable to get out of. order. We, laim s ur in en ion-.

1,-In 'a. device of the class. described, a v l e casing ha ing an. nclined parti i n i+ viding it into separate compartments, oneof I the latterbcing adapted to communicate with the gage glass, 2, boiler-connecting stem del tac ably connected to the casing and com- I the. other of said compartments, a valve mountedonthe u nder side of a while the casingis said partition and capable of insertion and removal while the casing is detached from the stem, and a cut-off forming a part of the stemandserving to prevent esca e of fluid detached therel iom l 2. -A device of the class described com-, prising a casing provided with an partition for dividing it into separate com-l partments, one of the latter being adapted to fitted n a d inclined communicate w th. he gage glass, an automatic valve embodying a removable. bushing fitted, in th pa tition and a shutter arranged at the und r side of aid in lined artition and hav ng i pper po ion pivots thereto, tha c mpartment of the casing containing the pivoted shutter having an opening therein, a boiler attaching stern detachably fitting said opening and providing means ofaccess to said valve when the casingis detached therefrom, and a cut-off fitted 111. said stem for preventing escape of fiuidaftcr detachmen-t of the casing from the Stein! 3. A deviceof the class described comprising a casing provided withan inclined partition forming separate compartments, one of whi h is adapte to communicate with. the other with theboiler, andathe compartment communicating with the boiler and having its upper edge pivoted to said partition, the shutter member being sus pended in a vertical position when, openv and ap e to ng nto an incline po i ion o cooperate with t evalvesseat.

5. A device of the class described compEiS- ing a hollow casing provided with a partition which divides it into'separate compartments adapted to communicate respectively. with a gage glass and. boile h casing beingp vided with an opening leading artment adapted for connection to the boiler, a. boiler connecting stem, detachably opening and provided with means for cutting oifthe fiQW of fluid hrough the stem, a bushing capable of insertion. and removal, through while the latter is;

d tached m the em, partition and provided with valve seats-ari ranged at op osite sidesofithepartit on, an automat c v v r angedmtho mpar ent mmun ati g with, he. holler, aid: who

aid bush ng e ng e aohably fit d msaid 1.05 l to the comsaid opcnin in the casing being pivotal v susp n ed; at its upp r edge and rrange ooodpe ate writhcne of he valv eats of he bushing. and: av sec nd valve arranged to communicate with the other seat on said bushing.

6. A device of the class described comprising a hollow casingprovided with an inclined partition dividing -1t.into separate coinpartmentsadapted to communicate respectively with a gage glass and boiler, an automatic valve mounted in the compartment communicating with the boiler and embodying a therein dividing the easing into separate tively to the vertical,

. tween the compartments "casing for discharging sediment from the "an inclined position a valve casing having a partition dividing it for dividing it into separate compartments adapted to communicate respectively with vertical position when open and arranged to i the gage glass and boiler, of a bushing removswing into an inclined position beneath the l ably fitted in the partition having a passage partition when closed, and a controlling del therethrough and provided with valve seats vice arranged to cooperate with said shutter l at opposite ends thereof inclined relatively to to move it into open position. the vertical, a check valve arranged at one 7. A device of the class described comprisside of the partition and adapted to swing a valve casing provided with an inclined into an inclined position to cooperate with artition dividing the easing into separate one of the valve seats of the bushing and norcompartments adapted to communicate remally suspended freely in a vertical position,

spectively with a gage glass and boiler, the and an inclined axially adjustable valve stem partition being provided with a fluid passage arranged at the opposite side of the partition connecting the compartments, an automatic having a valve seat thereon adapted to covalve for controlling communication beoperate with a valve seat on the bushing and through said pasprovided with a reduced extension adapted sage, said valve comprising a freely movable to roject through the passage in the bushing member pivotally. suspended at'its upper an disengage the check valve from its seat. edge and normally vertical in open position 11. A device of the class described comand adapted to swing into an inclined posiprising a valve casing adapted for attachtion in closing, and a drain cock fitted in the ment to a boiler and gage glass, an automatic valve inclosed in the casing for controlling communication between the boiler and gage glass, said valve embodying a freely suspended member pivoted at its upper edge and adap'tedito occupy a vertical position when openandan inclined position when closed, a pintle turnable with said member, and an indicatormovable with the pintle'and arranged thereon tocounterbalance the Weight of said ivalve member, indicia; being provided to coso 'erate with the indicator for designating it e position occupied by the valve member. 12. In a water gage, the combination with a valve casing having an apertured partition dividin adapte to communicate respectlvely with the gage glass and boiler, of a bushing removfreely movable shutter pivotally suspended at its upper edge and adapted to occupy a compartment at the under side of the partition and which communicates with the boiler.

8. Ina water gage, the combination with a valve casing having an inclined partition compartments adapted to communicate respectively with the gage glass and boiler, and a valve seat on the partition inclined rela-a of means for control-i ling communication between the compar-tel ments embodying a endent shutter pivoted at its up er edge an normally suspended in a vertica position and adapted to swing into to cooperate with said seat.

9. In a water gage the combination with and having a hinge thereof, a shutter adapted to cooperate wit one side of the bushing as a valveseat and having hinge lugs adapted to cooperate with that on the bushing, the lug on'the bushing and firmly fitted into the lugs on the shutter and extending to the exterior of-the casing, and an indicator ar- In testimony whereof we have hereunto into separate compartments adapted to communicate respectively with the gage glass and boiler, and a valve seat on theipartition inclined relatively to the vertical' 'fof means for controlling communication between. the compartments embodying a shutter arranged at oneside of the partition and pivoted at its upper edge, said shutter when open hanging freely in a vertical positionfan-d a valve stem having-a portion thereon'fadapted to cooperate with the said shutter t'o'unseat it, set our hands in presence of two subscribing I a valve seat on the said stem and a cooperatwitnesses. a ing valve seat on the partition for interrupt- ROBERT M. SHAD. ing communication between the compart- V GUY N. SHAD. ments independently of the said shutter. l Witnesses} FRANK W. CHURCH,

10. In a water gage, the combination with l EDWARD PIERSON.

a valve casing having a partition thereinl it into separate compartmentsa pintle loosely fitting I; l 1 l 

